MER INFORMATION

Evaluation of microcontroller architectures for PMSM control

Due to hybridization of vehicles, electrical motors like permanent magnet synchronous motors
(PMSM) are playing a major role in the automotive industry. In order to upgrade the microcontroller
used for the prototype of the PMSM control in Volvo Group Truck Technology, a
study on available micro-controllers presently on the market and to evaluate a few of the suitable
micro-controllers is necessary. In this thesis a evaluation of Texas instrument micro-controllers
TMS320F28377D and TMS570LS1227 are performed. In the first part of the thesis, a digital control
algorithm has been implemented in the Matlab simulink and effect of various digital control
parameters like ADC resolution, PWM resolution, ratio of switching frequency to electrical frequency
of stator current etc. has been discussed. Based on the simulation minimum requirements
of PWM and ADC resolution has been found to be 10 bit. Also the simulation results showed that
for the drive system under consideration the ratio fsw=felec should be 40 or more to have a better
torque control.
In the second part of the thesis the best available micro-controllers suitable for PMSM control
has been listed and the two of the most suitable micro-controllers TMS320F28377D and
TMS570LS1227 has been selected for further evaluation. In the third part of the thesis, the digital
control algorithm has been implemented in both the selected micro-controllers and the motor control
performance has been evaluated using the hardware in the loop simulation with the real time
motor model implemented on a dSpace system. The CPU utilization for the ISR in TMS570LS1227
for a switching frequency of 20 kHz and a CPU clock frequency of 80 MHz is measured to 30:2%.
But for TMS320F28377D, the CLA executes the ISR. So its CPU utilization is almost 0% and
its CLA utililization is 23:8% with the same switching frequency of 20 kHz and the CLA clock
frequency of 80 MHz. The fault response time for the micro-controllers to block the gate pulses has
been found to be sufficient to protect both the PMSM and the VSC. The fault response time has
been measured to be 20 ns for TMS570LS1227 and 60 ns for TMS320F28377D. Also the effect of
PWM and ADC resolution on the motor control has been compared with the simulated results and
found to have the same effect on the real system. The real system torque response do not look like
the designed first order response due to the presence of the additional impedance in the hardware
connecting the micro-controller evaluation board and dSpace.
Though both the evaluated controllers is suitable for PMSM control, TMS570LS1227 has been
developed by Texas Instrument with safety features that helps to achieve ASIL-D. But it doesn`t
have any special units to perform mathematical operation fast and to take care of some of the
critical tasks independent of the CPU. TMS320F28377D has, a fast processing mathematical unit
and a CLA to take care of critical tasks independent of the CPU. Though it has some safety
features to achieve ASIL-D, it is not assured that it will be possible to achieve, unless application
developers work on it. Based on the evaluation of the micro-controllers a suitable architecture that
provides the powerful control performance and safety features that helps in achieving ASIL-D has
been suggested.

Dela på webben

Skapa referens, olika format (klipp och klistra)

BibTeX @misc{Jeyabalan2015,author={Jeyabalan, Rathinavel},title={Evaluation of microcontroller architectures for PMSM control},abstract={Due to hybridization of vehicles, electrical motors like permanent magnet synchronous motors
(PMSM) are playing a major role in the automotive industry. In order to upgrade the microcontroller
used for the prototype of the PMSM control in Volvo Group Truck Technology, a
study on available micro-controllers presently on the market and to evaluate a few of the suitable
micro-controllers is necessary. In this thesis a evaluation of Texas instrument micro-controllers
TMS320F28377D and TMS570LS1227 are performed. In the first part of the thesis, a digital control
algorithm has been implemented in the Matlab simulink and effect of various digital control
parameters like ADC resolution, PWM resolution, ratio of switching frequency to electrical frequency
of stator current etc. has been discussed. Based on the simulation minimum requirements
of PWM and ADC resolution has been found to be 10 bit. Also the simulation results showed that
for the drive system under consideration the ratio fsw=felec should be 40 or more to have a better
torque control.
In the second part of the thesis the best available micro-controllers suitable for PMSM control
has been listed and the two of the most suitable micro-controllers TMS320F28377D and
TMS570LS1227 has been selected for further evaluation. In the third part of the thesis, the digital
control algorithm has been implemented in both the selected micro-controllers and the motor control
performance has been evaluated using the hardware in the loop simulation with the real time
motor model implemented on a dSpace system. The CPU utilization for the ISR in TMS570LS1227
for a switching frequency of 20 kHz and a CPU clock frequency of 80 MHz is measured to 30:2%.
But for TMS320F28377D, the CLA executes the ISR. So its CPU utilization is almost 0% and
its CLA utililization is 23:8% with the same switching frequency of 20 kHz and the CLA clock
frequency of 80 MHz. The fault response time for the micro-controllers to block the gate pulses has
been found to be sufficient to protect both the PMSM and the VSC. The fault response time has
been measured to be 20 ns for TMS570LS1227 and 60 ns for TMS320F28377D. Also the effect of
PWM and ADC resolution on the motor control has been compared with the simulated results and
found to have the same effect on the real system. The real system torque response do not look like
the designed first order response due to the presence of the additional impedance in the hardware
connecting the micro-controller evaluation board and dSpace.
Though both the evaluated controllers is suitable for PMSM control, TMS570LS1227 has been
developed by Texas Instrument with safety features that helps to achieve ASIL-D. But it doesn`t
have any special units to perform mathematical operation fast and to take care of some of the
critical tasks independent of the CPU. TMS320F28377D has, a fast processing mathematical unit
and a CLA to take care of critical tasks independent of the CPU. Though it has some safety
features to achieve ASIL-D, it is not assured that it will be possible to achieve, unless application
developers work on it. Based on the evaluation of the micro-controllers a suitable architecture that
provides the powerful control performance and safety features that helps in achieving ASIL-D has
been suggested.},publisher={Institutionen för energi och miljö, Elteknik, Chalmers tekniska högskola,},place={Göteborg},year={2015},keywords={PMSM, PWM resolution, ADC resolution, TMS570LS1227, TMS320F28377D, Digital control, SVPWM},note={69},}

RefWorks RT GenericSR ElectronicID 220581A1 Jeyabalan, RathinavelT1 Evaluation of microcontroller architectures for PMSM controlYR 2015AB Due to hybridization of vehicles, electrical motors like permanent magnet synchronous motors
(PMSM) are playing a major role in the automotive industry. In order to upgrade the microcontroller
used for the prototype of the PMSM control in Volvo Group Truck Technology, a
study on available micro-controllers presently on the market and to evaluate a few of the suitable
micro-controllers is necessary. In this thesis a evaluation of Texas instrument micro-controllers
TMS320F28377D and TMS570LS1227 are performed. In the first part of the thesis, a digital control
algorithm has been implemented in the Matlab simulink and effect of various digital control
parameters like ADC resolution, PWM resolution, ratio of switching frequency to electrical frequency
of stator current etc. has been discussed. Based on the simulation minimum requirements
of PWM and ADC resolution has been found to be 10 bit. Also the simulation results showed that
for the drive system under consideration the ratio fsw=felec should be 40 or more to have a better
torque control.
In the second part of the thesis the best available micro-controllers suitable for PMSM control
has been listed and the two of the most suitable micro-controllers TMS320F28377D and
TMS570LS1227 has been selected for further evaluation. In the third part of the thesis, the digital
control algorithm has been implemented in both the selected micro-controllers and the motor control
performance has been evaluated using the hardware in the loop simulation with the real time
motor model implemented on a dSpace system. The CPU utilization for the ISR in TMS570LS1227
for a switching frequency of 20 kHz and a CPU clock frequency of 80 MHz is measured to 30:2%.
But for TMS320F28377D, the CLA executes the ISR. So its CPU utilization is almost 0% and
its CLA utililization is 23:8% with the same switching frequency of 20 kHz and the CLA clock
frequency of 80 MHz. The fault response time for the micro-controllers to block the gate pulses has
been found to be sufficient to protect both the PMSM and the VSC. The fault response time has
been measured to be 20 ns for TMS570LS1227 and 60 ns for TMS320F28377D. Also the effect of
PWM and ADC resolution on the motor control has been compared with the simulated results and
found to have the same effect on the real system. The real system torque response do not look like
the designed first order response due to the presence of the additional impedance in the hardware
connecting the micro-controller evaluation board and dSpace.
Though both the evaluated controllers is suitable for PMSM control, TMS570LS1227 has been
developed by Texas Instrument with safety features that helps to achieve ASIL-D. But it doesn`t
have any special units to perform mathematical operation fast and to take care of some of the
critical tasks independent of the CPU. TMS320F28377D has, a fast processing mathematical unit
and a CLA to take care of critical tasks independent of the CPU. Though it has some safety
features to achieve ASIL-D, it is not assured that it will be possible to achieve, unless application
developers work on it. Based on the evaluation of the micro-controllers a suitable architecture that
provides the powerful control performance and safety features that helps in achieving ASIL-D has
been suggested.PB Institutionen för energi och miljö, Elteknik, Chalmers tekniska högskola,LA engLK http://publications.lib.chalmers.se/records/fulltext/220581/220581.pdfOL 30